Improved mirror box construction to ensure accurate assembly thereof

Abstract

A mirror box for a camera includes a mirror box section for rotatably holding a mirror, a lens mounting section for connection to a lens and a shutter plate section that defines an inlet opening for a shutter assembly, all three sections being defined as a one-piece unit. By this structure, the central axes of the lens mounting section, the shutter assembly and the mirror box coincide. This enables the operating position of the shutter assembly to be adjusted directly with respect to the light axis of the photographic lens.

What is claimed is: 
     
       1. A mirror box for a camera comprising: a mirror box section including a connector that rotatably holds a mirror;   said mirror box section including first and second oppositely facing surfaces, formed on a single piece of material, and located on oppositely facing sides of said mirror box section;   said first surface of said mirror box section including a lens mount section having a first opening that defines a photographic lens light axis; and   said second surface of said mirror box section defining a shutter plate section having a second opening that is aligned with said first opening and defines a central axis of a shutter assembly.   
     
     
       2. The mirror box of claim 1, wherein said single piece of material is a resin material. 
     
     
       3. The mirror box of claim 1, wherein said shutter plate section includes position determining structure for adjusting a position of shutter blades of a shutter assembly attached to said shutter plate section. 
     
     
       4. The mirror box of claim 3, wherein said position determining structure is a hole in said second surface of said mirror box section. 
     
     
       5. The mirror box of claim 1, wherein said first opening of said lens mount section is circular. 
     
     
       6. The mirror box of claim 1, wherein said lens mount section includes a bayonet connector. 
     
     
       7. The mirror box of claim 1, wherein said photographic lens light axis coincides with said central axis of said shutter assembly. 
     
     
       8. A mirror box for a camera comprising: a one-piece mirror box housing including means for rotatably holding a mirror;   said one-piece mirror box housing including first and second oppositely facing surfaces located on oppositely facing sides of said mirror box housing;   said first surface of said mirror box including a first opening that defines a photographic lens light axis and photographic lens mounting means for attaching a photographic lens to said first surface; and   said second surface of said mirror box having a second opening that is aligned with said first opening and defines a central axis of a shutter assembly, said second surface including shutter blade position determining means for adjusting a position of shutter blades of a shutter assembly attached to said second surface.   
     
     
       9. The mirror box of claim 8, wherein said one-piece mirror box housing is made from a resin material. 
     
     
       10. The mirror box of claim 8, wherein said shutter blade position determining means is a hole in said second surface of said one-piece mirror box housing. 
     
     
       11. The mirror box of claim 8, wherein said first opening in said first surface is circular. 
     
     
       12. The mirror box of claim 8, wherein said photographic lens mounting means includes a bayonet connector. 
     
     
       13. The mirror box of claim 8, wherein said photographic lens light axis coincides with said central axis of said shutter assembly. 
     
     
       14. A mirror box for a camera comprising: a lens mount plate having a first opening that defines a photographic lens light axis;   a shutter plate having a second opening that defines a central axis of a shutter assembly;   a combination member extending between said lens mount plate and said shutter plate on opposite sides of said lens mount plate and said shutter plate, said combination member rotatably supporting a mirror;   said lens mount plate, said shutter plate, and said combination member being of one-piece construction.   
     
     
       15. The mirror box of claim 14, wherein said lens mount plate, said shutter plate, and said combination member are made from a single piece of resin material. 
     
     
       16. The mirror box of claim 14, wherein said shutter plate includes position determining structure for adjusting a position of shutter blades of a shutter assembly attached to said shutter plate. 
     
     
       17. The mirror box of claim 16, wherein said position determining structure is a hole in said shutter plate. 
     
     
       18. The mirror box of claim 14, wherein said first opening of said lens mount plate is circular. 
     
     
       19. The mirror box of claim 14, wherein said lens mount plate includes a bayonet connector surrounding said first opening. 
     
     
       20. The mirror box of claim 14, wherein said photographic lens light axis coincides with said central axis of said shutter assembly.